By the end of the day, NYPD Deputy Commissioner Paul Browne said the snafu was traced to a 2002 computer test, though he couldn't explain why the couple's address was used as a test case in the first place.

He said that when the Martins complained to cops in 2007 about their scary series of official doorknocks, police tried to wipe their address from the system.

But the raids continued. The most recent, on Tuesday, left 83-year-old World War II vet Walter Martin woozy from soaring blood pressure.

Investigators found yesterday that not every computer file bearing the Martin's address was deleted.

In order to be "doubly cautious" in the future, Browne said cops have flagged the Martin's address so no officer will be dispatched to the home without double-checking the address.

A skeptical Rose Martin asked the department to write her an official letter, dubious that such a long-standing problem could be fixed in a day.

"It seems like too simple a correction for something that has been going on for eight years," she said.

Meanwhile, The News learned problems with the house go back to before the Martins bought it in 1997: The previous owner sold the modest Marine Park house because police and fire crews kept showing up at his door chasing bogus reports.

In his case, the freaked-out former owner - who fled the city because of what happened at the house - told The News he was being targeted by a still-unknown tormentor who sicced the cops on him 30 times in the three years starting in 1994.

"Someone was calling from different pay phones in the area, calling in fires, domestic disputes, kids screaming - whatever," said the man, who is still so scared he asked his name not be printed. "All totally unfounded."

The ex-owner said he complained multiple times starting in 1994, and his brother, a city firefighter, helped to get fire marshals to investigate.

The calls, which the marshals believed might have been made by a devious vengeful neighbor, stopped about six months before he sold to the Martins, he said.

"I always thought I was being targeted personally - and, to be honest with you, it freaks me out that it's happening again," the ex-owner said.